By solving system by elimination, x= -1 and y=3
Step-by-step explanation:
We need to solve the systems by elimination.
![12x+9y=15\,\,\,(1)\\3x+2y=3\,\,\,(2)](https://tex.z-dn.net/?f=12x%2B9y%3D15%5C%2C%5C%2C%5C%2C%281%29%5C%5C3x%2B2y%3D3%5C%2C%5C%2C%5C%2C%282%29)
Multiply eq(2) with 4 and subtract eq (1) and eq(2)
![12x+9y=15\,\,\,(1)\\12x+8y=12\,\,\,(2)\\-\,\,\,\,-\,\,\,\,\,\,\,\,\,\,\,-\\--------\\y=3](https://tex.z-dn.net/?f=12x%2B9y%3D15%5C%2C%5C%2C%5C%2C%281%29%5C%5C12x%2B8y%3D12%5C%2C%5C%2C%5C%2C%282%29%5C%5C-%5C%2C%5C%2C%5C%2C%5C%2C-%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C-%5C%5C--------%5C%5Cy%3D3)
Now, multiply eq(1) with 2 and eq(2) with 9 and subtracting both equations:
![24x+18y=30\\27x+18y=27\\-\,\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\-------\\-3x=3\\x=\frac{3}{-3}\\ x=-1](https://tex.z-dn.net/?f=24x%2B18y%3D30%5C%5C27x%2B18y%3D27%5C%5C-%5C%2C%5C%2C%5C%2C%5C%2C-%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C-%5C%5C-------%5C%5C-3x%3D3%5C%5Cx%3D%5Cfrac%7B3%7D%7B-3%7D%5C%5C%20x%3D-1)
So, by solving system by elimination, x= -1 and y=3
Keywords: Systems by elimination
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Jeremy will need 3.75 rolls of fence to completely surround the garden but if you are rounding he will need 4.
We are given the electricity cost as 5 cents per
kilowatt-hour. We should notice that the cost is actually in the form of:
electrical cost = cost / (power * time)
Therefore to get a number which is in terms of cents
alone (cost alone), therefore we should multiply the given electrical cost
value with the power and time.
Power = 80 watt = 0.08 kilowatt
Time = 24 hours
Therefore the cost is calculated as:
cost = electrical cost * power * time
cost = [5 cents / (kilowatt hour)] (0.08 kilowatt) (24
hour)
cost = 9.6 cents
Answer:
<span>9.6 cents</span>
Answer:
add me on snap
Step-by-step explanation:
bre.twining05
Number one is B, because if you do the equation 2.94(total price)/ 7(number of items) it gives you the answer $0.42 then for number two A=$1.8 B=$1.83 C=1.81 and D=1.82 leaving A with the best price per bottle of juice. Hope this helped!